水文年内不均匀系数的探讨

A DISCUSSION ON COEFFICIENT OF NONUNIFORMITY IN HYDROLOGIC YEAR

本文从物理概念、年内不均匀系数等值线图的绘制与应用、计算机程序应用三个方面提出采用年内分配不均匀变差系数C。研究降水、径流及泥沙年内不均匀程度,并用长江上游干支流250个水文站多年平均(?),(?)_1完全调节系数(?)_L翔实资料进行全面对比论证,对完善年内均匀系数有一定的理论和实用价值。

The Variation coefficient of distribution in hydrologic year Ca is specifie value of mean square deviation δand hydrologic value in mean time interval V. Mean square deviation repre-sent that the hydrologic value of every time interval in year departs from level of the mean interval. The physical cencept of Ca is clearer than coefficient of nonuniformity C1 and CL;Ca the coefficient of nonuniformity in runoff years of 250 hydrologic stations at the upper reaches of the Changjing River during 1958-1986 represents that making isogram with C. is more easy than C1 or CL;and the C. quantitative calculation on microprogram is more accurate than them.In addition,the variation coefficient of distribution in year Ca of the sediment discharge and concentrarion and runoff in corresponding year of every tributary at the upper reaches of the Changjiang River is analysed in this paper. The author suggests that Ca and Ca of mean annual value should be the synthetic index to judge nonuniform level in year of precipitation, runoff, sediment (sediment discharge and concentration).